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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e552766438725a82b2df562988167d0be18b599caeaefe03caefe25a151e3d' 
  AND token = 'NIZYi5OoT4cbCvOxCAiBS31Fl+fFCSrw+pq06pl/niA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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