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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475571015b91afa7ce9905e8e80a3cb6dadce49e88b0408867468032e3cffa11' 
  AND token = 'XoNrcZspeFMbgKPqS3P5B191fIy1ADEI1+ahuKJc3zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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