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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a7cfb77f3a4e627f27b187c4faf911f81b52e231565505c6edef2ec6d0dc34' 
  AND token = '1z8vR9JBYiaXOv5lW2Xlq8Ttrdl5QXYme+VKAc4F5Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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