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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1bcc60b5c0b4bdc4bd37d9d90b0ee0622439b527707539827787679dbe480c' 
  AND token = '4blB6l6FeV84nfeZXVbMYsuSZcdWb/yIpS937sWFSPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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