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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aec6ba80f81f9472bc561ba356a417c8092b95ea6e8d5b8b027ba18ec698ff4' 
  AND token = 'Y5SyLB9ysDxIYlJwJiY+d+yN3qlpJTC6sEEPL9e1BXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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