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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2d2853b4c33013d791fa850b9bf09848cb2a4a5ca68ea51e0463854baef008' 
  AND token = 'AZ/FYWd4+hofUb7HhdjwnN95PlZr4h+jimrAoacvp54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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