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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867e8077eefdbac33b0467d6e5b07b33a6ca5be30a50ace5fb71002b663669dd' 
  AND token = 'sT4M3FxlAJ2oco0ESXP4TZdh22R4Qp3SDvrYYGbOLCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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