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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce59aa3cdc73e6b355cbcc853472b19c46bcd248470b6c52b1395eb5575d583' 
  AND token = 'wFNUPyk24WSqJjelQMZGCvF7H2aeWAeaRQ+22quYWo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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