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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7ca34c72e4dc7e3cbcb69726b18f546cb4ceeb404051579931add1f5b898c9' 
  AND token = 'L6TK21rmqmy0aiT0w8Yom90Bou7whzLGTc5sHR9y47c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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