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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28f52c65fb032cb86df73a949542706526324152077ccbabc5c213772d0dc65' 
  AND token = 'uWoOVZdNm36j2xBJfKu3hx7Oe0xnyKEt43bAq8+Vug8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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