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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b6f02ee8c66c0db4b5fadb245d86380f639a3beb9a176901493bb98fa9d53d' 
  AND token = 'PHfuNCUr2mtsRX9jx1rcCkpNmIKzfZ/mdw9BzP1/Lxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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