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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da063eba00314eb167f77d1ea72f50fc0fb30ce16fab2af3e10758ee69241a60' 
  AND token = '7fCUv/o68GYE3u22cYyJZVnEazvkMPZSmfk0ve+aCm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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