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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132c1dfce8e8f70a344e40d6f805bbc394bcf0c4ff7a535a04c32dc993f3adaf' 
  AND token = 'UzD+6cRJZACWVDY14Wlu9eFxp7xpht3jYLrc2ItAykU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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