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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bedba32e8f705eef9aede050c9bad634ee90d34d04c073b64a577fc6c04f9f' 
  AND token = 'Ma5WTys4bF1mkaphNCHltZe+/HM/ZI9Rck7KH6ZA13U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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