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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686eba6b4a4016665e6fce1b0885d359cdde1cab52ef9de4848481dfd3e9d6f8' 
  AND token = 'DFTf5ug5wBccLSsDFb6ag+7LOac9QaLQH4ajJVwbnNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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