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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1e97827f2f97fc466c378f7c79aa03e4a485fbeded4558cbc5d8392b7021e7' 
  AND token = 'l+M+qVrHrk4M6bFbqgy1oTmQD8b5BqP8ggNJ6Jtauwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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