Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb864adc4a3e03cade9d7aa2b627e3ae531811cdff86b79cd1a4e2ee54c0bb7d' 
  AND token = 'LHraxpUB3kTbsAKyeVdHZXweR1ugNA0Yzuf/JdUQMD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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