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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57cbf40a15876110c75aa92e16ffaa946b76086efd4c4e1e01b1f6040487ab52' 
  AND token = 'HH6IEHVXaxLH6svdTjR3NB3p/G0xcyrvnrrZr7tSoWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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