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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8620a344edfba5b3e0d8e20d7a6c4f696985c94fb97e9e8a048ff5e7a880f30' 
  AND token = 'fVDPLQMxj+aRdFpKtqU7xYiZm0nsc/tGN97OzXOBqf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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