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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a303ab2b8251098a32e0bb595d8980b5f9450665ff4217d46679390b44632dcb' 
  AND token = 'WaTysWM6avHbigOsLAUEP3QRZG2dfhwYPX7yIiInb38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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