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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892ec4f82d5ab66e35b5c0675e5fea673d8e97bba9987f590c114a7e9bebbfc8' 
  AND token = 'QY97NBOLBf5amAl2Gr3MJrc6ZoyERpnC5ZPxZTbXXs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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