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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6588bc5a50fb167395a3fb695f01481e983e798c5dad520ae3b81dc8642c38e' 
  AND token = '2FmguezgUypgpvVvfL23m6RidxTEj5xD0VyuW2ofuos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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