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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37dbdf38dda5ac9a84a24ccc96e94269e528ae09280564b975aae052be7e7127' 
  AND token = 'aAjSS2L14Io9UfldWvfVUFpieutDYyGbQCnQgnCp2m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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