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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c48955a97599abc3efd374879aeb1e521dda9d0c1ea5091bb2afd4b89901a8e' 
  AND token = 'nLzvK07EPDRW0f++TBBoCLbwIk+1ORXhWwA3dmLwzF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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