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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd354cec7a4d6c591ae69948dd947f6390feca42063455c8eda90dfd19ffb61e5' 
  AND token = '5Yh5fDYV4705VJvapp5e/kuaa+DVshIq+zLbrYXKjsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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