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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50fe8c011b45051a6e727f2869873eb6d2a10015a35e7242ddf0a4e37b4858d6' 
  AND token = 'F2QYGo8+eRzNz0r/vD/KPfAZYR6kftPMWl2pJIfMvK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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