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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0846e6eb58c96f978a8de916356889d2975e7ad8f9bb0314121c6f4c1ac38b5' 
  AND token = 'c7oLII57r5xQTHtpmpUk8RYlz5j6I9jCesLuTDOPjf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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