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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfbb0c0358dad006b35a84ef533256443e5cd0311998bce58c124498701cdc1' 
  AND token = '5zYtPh0ZeHG1g2RgPqaHKvNvzpABvyhT5kmEtoZamYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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