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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d395aac023edd7407d4707a474e1a4327858acb7ab045a3033e38c8baea4013' 
  AND token = 'zz3RcJH/dtNdrfcmjGEhM2pGP6JEXi8cqAqw/9dZ71o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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