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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a93a3474820808e6f13cd429643499434ce78f61ef1b19e0eba1daeea42df27' 
  AND token = 'KmwiTfY63qpChS+ycEc1kO2y4kSkR2QRbmhGkz4djUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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