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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808545941b75c569419ba094ed2c0c99ff48b28c81628c7a54dc0247839b3351' 
  AND token = '2bbLNteQuTgMB227LlCklyiStSMDgJ+MQG34JasqrWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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