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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d8c131102fb265da1e0dc58cb1110cc3a9ffc1034296fbbb331cc589e8eeb1' 
  AND token = 'Bwjn5XhjDZELcp65qN7FSHjetETF5QNAdT0MMV/h3jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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