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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c665292cd85c8ce6a786ced3615a206c65d76830fba3b9995644041ea83581c5' 
  AND token = 'hDhWBLr1wv9A1TGGp5mUXwE05U90wGSwY20ENGUVJIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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