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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab3b08c53313b01b2dc109e4f9b9cb30f333cdb4722743b6ef71a6136f6f249' 
  AND token = '1CricS2KVAKYTC82z70Uw/vHL7D3jeFs9ef1o3G7fLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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