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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55bb00c71c494e8c01bc6ad35e85ca4285df599b53caa3cb2dd3d32f2f7f4cd' 
  AND token = 'ar+PK5pIz2tG/clu5/mP5HRCg5ZCXo+bGyPL/i/gZPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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