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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add05093501e7125ae0029143b51791efbc2aafb028432fc6fc806dafe3b21f4' 
  AND token = 'mKfmxddnOoWcCV/+h7H7phBPoV2jNAtlzLTF4nQ+cFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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