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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68007b206f94a697385fa10653ab351eaf39180b301a490567c12d8de0a60d3' 
  AND token = 'oBGYGGHDskdFmmpi2sRqur+7+zC+lgL2iwLeipOcJe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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