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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003d147724fba720e97e08b4edd993b1c251486022aa94cf8689229b2215e089' 
  AND token = 'i7a3naT4D/kChjH/pnfGaU9TG32eNwxFTsRTmGh9+9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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