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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331ecec5bb198b5d9297087b2aef96f6cfd42b8844469e804129d8179833a5c9' 
  AND token = 'vtWue8iYr744gEeIN27Ef2FmJ+U5spWSFha8MLDSQ8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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