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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d3e92b84f98e9ecd976b155effd54782d9efebdb8cd2a6f72d8273c0d0fb31' 
  AND token = '8pQDEe+AS+EGw4YUOlW4Wi6zWbPIAhBp4WG0KyJYcEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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