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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523fa4a76aecf4542bf148e64b1fc8f18d43ee05ee26690fc83aa0d70cfedcf3' 
  AND token = 'zJSkw6PNmfocJ6thruz8xEzRA9c7u3B8nC+id/Jv+Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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