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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0af17c236bf579c05821a102908309111dd254d8ef271cdc084c23b76f32a14' 
  AND token = 'oK8ZV6zvyR7G7QNTdzEIp0Y2qI9Wj10UanfYe6+F7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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