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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29530215f1e28c3911ae07fd3ba183a6415b1f16639a4c78e94222b6fc8e3cd8' 
  AND token = 'wmstOP4l+334pyEqbKlCA6I/SyLJQLrZN/bwb+bom5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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