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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a0d707bb23616953b491e825059c252d92c575c9737b54f62694a79b2849ec' 
  AND token = 'zPQmD2W9yfFLp5ytlYYve7hu3lsZv5geRN9yI8P9Xmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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