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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c5b44488e3e6d41f91893c4e9b3cea19097b454af5f1994e4407a8ac15b36d' 
  AND token = 'vX6hAeXaHQgBj8w/Xm4GfxXD+GLyCpo0H3QT9VG+Z+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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