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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320e2392943709e5a774ad032f26fc4b393f080b02e1a15f24b64724bd0cd6fd' 
  AND token = '59qlexMrTnQwZkKz7Ivqypx1VRsY/ngkvI/zVCN0I1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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