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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e52c9510be84b1aa63d61452c66bb03797803711f21016377f58e6acb226c12' 
  AND token = 'Nn21qjAh2EAzz4OlyN7KbOCFCPBZME9kPNTUEyboB00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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