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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251f556cc31b3827fbd1562a438c491d821d2aeeb17e8d0d92989a1f84289440' 
  AND token = 'FdFIigPJJu5+e4fzKRNHmP5WqAWREcdQWt/v6bqykCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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