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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '321d6073f6c8ec3e6551546903548e9b89a4a29050fac17eba40e6cc5af9d67a' 
  AND token = 'szoiPe/zNjGW3pQXP0zyiVsIs1G7p+bRMotR1D1VZFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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