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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb76f4e68bff54504692f0bcf8ead1dbae2431f92c81a553b5ebadc78b89c891' 
  AND token = 'oaQ4LuKoiRf7CmprzCtNffLWzFJIgd7S+y6bX5nGSIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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