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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f98f2df5c81389c9633b62a1bb26ef82b71e67acae806c1693acf9cbdd6cd0f' 
  AND token = 'eyxncoROhwsXe2MivZlx2v7a9rOW4Q8ILOUbrLeP8vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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