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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563015368351ed13eddb1c517568feaca74998494546c03146345103395d61c5' 
  AND token = 'AcdbLhZ6e9MaLLcmi9m2A4Cav32aydQQYFlFX2LNXE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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