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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dbe7940d762af2f6b56c9085159566cf43ec285cf3d79a4d26970c9fc6463a' 
  AND token = '0UjpQjtqRSrs3u08taZ8bZO+Z0MgbrIgmWnAkEoisu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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