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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f39080d4e11d4df43ca1daaed7dc642bc98475f003ea2a3b14f6b56e2b77aa' 
  AND token = 'DFe6XTGVhj819pb4P9s0xa5ztf9qt5B6dlmcdlpm6zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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