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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ddc9ae4a9069d23246cdd0609945bb766239e8c433ad2354e6caf327f3857e' 
  AND token = '8pD1fmx5Hb5wcjaFIxzeZtSbuYfI7WFwIiPP3rXXnqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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