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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e905f50a55b97ff69d3dbc332299dd98b6a6f9914a71a04834a575a3e087c813' 
  AND token = 'h4Z3WLH4Qap+uFk1fIGFW94svBQbR9CObgyqlFSEX9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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