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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92aeb8e4a83553170a7575db3265fdd12ea441795cb427fac8d4d88e548ff0cd' 
  AND token = 'VDuDUy8P0XyRKvfXHrdqgfct/86DicAHpG2jFhsc694=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}