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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef82a582e7e6b7f075f094c750a7b6ef3989c51a4c84ea76d85c40f187cf7d7' 
  AND token = 'GdK5eFgsldAZSP88DHjVF+aLsVVRK1eEiueZ65Qwb8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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