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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f57df5944d89205343ce407d8cc9103ea0855103c20aa12aa4b48a23b81c04' 
  AND token = '2rpSLcBkK7MllIFrI9YvZjiZ7QTtd2cgy7XEQT0/6Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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