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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d84bbd5fd0e9c8d85b94da8aac19758d40d8ba5a33e999df2fd4555387bcfa' 
  AND token = 'gnxdWS0fLvFxvzhVHHJCheegGwSBjnM3nsFhxDzrZrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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