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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba39e33b4e728ebb955a3d8014c4684e225c20f36a9aa521c4e56c9d3d0cab56' 
  AND token = 'o2Hdu2OiEoGilTQJE+ib2556xBqUDielrKaH1XVCBrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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