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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e772843db51141ff1cce7804d3a23de49ad16213d72d58045e4c9f536aae9cdf' 
  AND token = '9x6Cor7TsI78WWe5rRZGWPjcsBF+WN+Y1FArsbAaHnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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