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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975eb998b7fc495e45ed3e455d23d5e30100ce2f58ff6ce21bffc246ba547a30' 
  AND token = 'UyFKB6nyX2duRXxaYFhOgPW9HkTVaOzZDsAiH70ssq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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