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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c85eecae70f3a363f852c777ddc8ae8034b6379d48d9eadf13d833917ddf72a' 
  AND token = 'AMWexGWM1X7GbWN9J34xrwyl70BDas9j3aM/kBBxOEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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