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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '453285af06dae3dd19af5c80393760d8bfe7e24fae54f73a15f71e9ccba08c5a' 
  AND token = '1QCSH8yeQ8dPqSxD7eWJaWLw6L5OlljQ6P+ts0o/iow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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