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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e1049a95584d662658aa5ffe66f07355c2bda32ba2d30dad7ef8cfbd86e801' 
  AND token = 'PiZSI7cs500Ik6M7X/gfecr3GwAYeR+odDzENNMP4Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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