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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3f255a56bcd2b7a03bfe24b8e0793540fe75738e56c995de76201c1e35222f' 
  AND token = 'FNVleweYc9zEXaz9xCkkbkQwQJKgp8Qhm7Dg7U/t6rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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